java会话程序:会话双方可自由通话看到对方发来bye则退出

注：当有多个工作站时，使用下面的方法判断是那一个工作站的消息。

1、怎样判断到了那一个工作站，并且是什么消息。

	if (WSAGETSELECTEVENT(lParam) == FD_ACCEPT)
	{
		for(i=0;(i<MAXClient)&&(m_aClientSocket[i]!=INVALID_SOCKET);i++) ;
		if(i==MAXClient) return 0L;//如果工作站到了还没有连接的，就退出FOR循环
		
		m_aClientSocket[i] = accept(m_pDoc->m_hServerSocket, (LPSOCKADDR)&m_sockClientAddr, (LPINT)&nLength);
		
		if (m_aClientSocket[i] == INVALID_SOCKET)
		{
			return 0L;
		}
        }

2、怎样确定是那一个工作站发来的消息

    for(i=0;(i<MAXClient)&&(m_aClientSocket[i]!=wParam);i++)
    {//接收消息，如果到了指定的工作站，就退出FOR循环。
    }

3、怎样初始化SOCKET

for(int i=0;(i<MAXClient);i++) 
    m_aClientSocket[i]=INVALID_SOCKET;



服务器方：


/*
自定义消息函数：

	LRESULT OnAccept(WPARAM wParam, LPARAM lParam);
	LRESULT OnReadClose(WPARAM wParam,LPARAM lParam);

typedef struct ZyMsg
{//用于发送与接收的结构
	char msg[100];
	int i;
}Msg;

public:

	SOCKET Client;        //客户的连接请求
	SOCKET ServerSocket;                 //SOCKET 
	SOCKADDR_IN m_sockServerAddr;          //SOCKET 结构
	BOOL IsTrue;                //服务器初始化与绑定成功
	Msg msg;                   //发送的数据缓冲区

//消息映射
	ON_MESSAGE(WM_CLIENT_ACCEPT,OnAccept)
	ON_MESSAGE(WM_CLIENT_READCLOSE,OnReadClose)
*/

void CPublicNetSoftDlg::OnOK() 
{//初始化与绑定服务器
    WSADATA wsaData;
    int iErrorCode;
    if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL
	{ 
         list.InsertString(0,"Winsock无法初始化!");
         WSACleanup();
         return;
	}

	list.InsertString(0,"服务器开始创建SOCKET。");

	ServerSocket=socket(PF_INET,SOCK_STREAM,0);    //创建服务器端Socket，类型为SOCK_STREAM，面向连接的通信

    if(ServerSocket == INVALID_SOCKET)
	{
         list.InsertString(0,"无法创建服务器socket!");
         return;
	}

    m_sockServerAddr.sin_family = AF_INET;
    m_sockServerAddr.sin_addr.s_addr = INADDR_ANY;   //向所有的IP地址发送消息
    m_sockServerAddr.sin_port = htons(8001);

    if (bind(ServerSocket,(LPSOCKADDR)&m_sockServerAddr,sizeof(m_sockServerAddr)) == SOCKET_ERROR) //与选定的端口绑定
    {
	    list.InsertString(0,"无法绑定服务器。");
        return;
	}

    list.InsertString(0,"服务器端口:8001.");

    iErrorCode=WSAAsyncSelect(ServerSocket,m_hWnd,WM_CLIENT_ACCEPT,FD_ACCEPT);
         // 产生相应传递给窗口的消息为WM_SERVER_ACCEPT ，这是自定义消息

    if (iErrorCode == SOCKET_ERROR) 
	{
         list.InsertString(0,"WSAAsyncSelect设定失败!——用于连接请求的消息");
         return;
	}

    if (listen(ServerSocket,1) == SOCKET_ERROR) //开始监听客户连接请求
	{
		list.InsertString(0,"服务器监听失败!");
        return;
	}

	IsTrue = TRUE;

 	list.AddString("服务器绑定监听成功。");
    return; 
}

LRESULT CPublicNetSoftDlg::OnAccept(WPARAM wParam,LPARAM lParam)
{//自定义接收客户机请求的消息   ON_MESSAGE(WM_CLIENT_ACCEPT,OnAccept)
	if (WSAGETSELECTERROR(lParam))
	{
		list.InsertString(0,"Error detected on entry into OnServerAccept.");
		return 0L;
	}
	
	if(WSAGETSELECTEVENT(lParam) == FD_ACCEPT)//如果
	{
	    Client = accept(ServerSocket,(LPSOCKADDR)&m_sockServerAddr,0);

	    if (Client == INVALID_SOCKET)
		{
			list.InsertString(0,"Server socket failed to accept connection.");
			return 0L;
		}
		
		WSAAsyncSelect(Client,m_hWnd,WM_CLIENT_READCLOSE,FD_READ|FD_CLOSE);

		IsTrue = TRUE;
	}
	
	list.InsertString(0,"有工作站连接上了服务器。");
	
	return 0L;
}


LRESULT CPublicNetSoftDlg::OnReadClose(WPARAM wParam,LPARAM lParam)
{//自定义的关闭与缓冲区有消息
	if(!IsTrue)
	{
		list.InsertString(0,"有数据到达，但是没有工作站连接。");
	}

	CString str;
	switch (WSAGETSELECTEVENT(lParam))
	{
	case FD_READ:
		if(recv(Client,(char *)&msg,sizeof(msg),0) == SOCKET_ERROR)
		{
			list.InsertString(0,"接收数据发生错误。");
			return 0;
		}
		str.Format("%s",msg.msg);
		list.InsertString(0,str);
		break;
	case FD_CLOSE:
		str = _T("工作站退出。");
		list.InsertString(0,str);
		closesocket(Client);
		break;
	}
	return 0L;
}



void CPublicNetSoftDlg::OnSend() 
{//发送数据
	if(!IsTrue)
		list.InsertString(0,"还没有工作站连接，或服务器没有初始化成功。");
	UpdateData();
	strcpy((char *)msg.msg,(LPCTSTR)str);
	msg.i = 0;
	if(send(Client,(char *)&msg,sizeof(msg),0) == SOCKET_ERROR)//	recv(ServerSocket,buf,sizeof(buf),0);
	{
		list.InsertString(0,"发送数据错误。");
		return;
	}
	else
		list.InsertString(0,str);
	list.InsertString(0,str);
	str.Empty();
	UpdateData(FALSE);
	((CEdit *)GetDlgItem(IDC_EDIT))->SetActiveWindow();
}


BOOL CPublicNetSoftDlg::DestroyWindow() 
{//当程序退出时，把SOCKET清空
	if(IsTrue)
		WSACleanup();
	
	return CDialog::DestroyWindow();
}







工作站方：

/*//自定义消息函数
	LRESULT OnReadClose(WPARAM wParam,LPARAM lParam);

public:
	SOCKET ServerSocket;                 //SOCKET 
	SOCKADDR_IN sockStruct;          //SOCKET 结构
	BOOL IsTrue;           //是否打开了连接
	Msg msg;             //发送与接收数据的缓冲区


        //消息映射
    	ON_MESSAGE(WM_CLIENT_READCOLOSE,OnReadClose)
*/



void CClientTestDlg::OnOK() 
{//连接
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL
	{ 
         list.InsertString(0,"Winsock无法初始化!");
         WSACleanup();
         return;
	}

	list.InsertString(0,"服务器开始创建SOCKET。");

	ServerSocket=socket(PF_INET,SOCK_STREAM,0);    //创建服务器端Socket，类型为SOCK_STREAM，面向连接的通信

    if(ServerSocket == INVALID_SOCKET)
	{
         list.InsertString(0,"无法创建服务器socket!");
         return;
	}

    list.InsertString(0,"服务器端口:8001.");

	LPCTSTR ip;
	ip = _T("192.168.0.100");
	DWORD dwip;
	if((dwip=inet_addr(ip))==INADDR_NONE)
	{
		list.InsertString(0,"IP赋值错误");
		return;
	}
    sockStruct.sin_family=AF_INET; //使用TCP/IP协议
    sockStruct.sin_port = htons(8001);
	sockStruct.sin_addr.S_un.S_addr = dwip;

	if(connect(ServerSocket,(LPSOCKADDR)&sockStruct,sizeof(sockStruct)) == SOCKET_ERROR)
    {
	    list.InsertString(0,"无法连接服务器。");
		list.InsertString(0,"");
        return;
	}
	else
	{
		char *buf = new char[100];
		strcpy(buf,"工作站连接成功。——发往服务器的消息。");
		send(ServerSocket,buf,100,0);
		delete buf;
	}

	WSAAsyncSelect(ServerSocket,m_hWnd,WM_CLIENT_READCOLOSE,FD_READ|FD_CLOSE);
         // 产生相应传递给窗口的消息为WM_SERVER_ACCEPT ，这是自定义消息

 	list.AddString("连接服务器成功。");
	IsTrue = TRUE;
    return;
}


LRESULT CClientTestDlg::OnReadClose(WPARAM wParam,LPARAM lParam)
{//自定义SOCKET 服务器的读消息与关闭连接消息函数
	char *buf = new char[100];
	CString str;
	switch (WSAGETSELECTEVENT(lParam))
	{
	case FD_READ:
		if(recv(ServerSocket,(char *)&msg,sizeof(msg),0) == SOCKET_ERROR)
		{
			list.InsertString(0,"接收数据发生错误。");
			return 0L;
		}
		str.Format("%s",msg.msg);
		list.InsertString(0,str);
		break;
	case FD_CLOSE:
		closesocket(ServerSocket);
		list.InsertString(0,"服务器退出。");
		break;
	}
	return 0L;
}

void CClientTestDlg::OnSend() 
{//发送按钮，用于发送数据
	if(!IsTrue)
	{
		list.InsertString(0,"服务器还没有连接呢？");
		return;
	}
	UpdateData();
	if(str.IsEmpty())
	{
		list.InsertString(0,"发送的字符串不能为空。");
		return;
	}
	strcpy(msg.msg,(LPCTSTR)str);
	msg.i = 0;
	if(send(ServerSocket,(char *)&msg,sizeof(msg),0) == SOCKET_ERROR)//	recv(ServerSocket,buf,sizeof(buf),0);
	{
		list.InsertString(0,"发送数据发生错误。");
	}
	else
		list.InsertString(0,str);
	str.Empty();
	UpdateData(FALSE);
	((CEdit *)GetDlgItem(IDC_EDIT_MESSAGE))->SetActiveWindow();
}

BOOL CClientTestDlg::DestroyWindow() 
{//退出时清空SOCKET DLL
	if(IsTrue)
	    WSACleanup();
	
	return CDialog::DestroyWindow();
}